Assigstob to stostderman



F. R. SUNDERMAN.

CARBURETER. APPLICATION FILED NOV. 22. 1917.

Patented Dec. 9,1919.

2 SHEETS-SHEET I.

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, BY aw F'. R. SUNDERMAN.

CARBURETER.

APPLICATION FILED NOV. 22. m1.

1,324,135. Patented Dee. 9,1919.

2 SHEETS-SHEET 2- INVENTOR By dbl M 7W ATTORNEYS si nna? nine FREDERICK R. S'UNDERIVIAN, OF DETROIT, MICHIGAN, ASSIGNOR '10 SUNDERIVIAN CORPORATION, OF NEWBURGH, NEW YORK, A CORPORATION OF NEW YORK.

CARBURETER.

Specification of Letters Patent."

Patented Dec. e, rare.

Application filed Noveniber 22, 1917. Serial No. 203,338.

To all whom it mag concern:

Be it known that I, FREDERICK R. SUNDER- MAN, a citizen of the United States, and a resident of Detroit, Wayne county, Michigan, have invented certain new and useful Improvements in Carbureters, of which the following is a specification.

My invention relates to carbureters, and more particularly to carbureters for internal vided with adjustable needle valves or other means of regulating the hydrocarbon, and the air valve is not adjusted in its operations by a spring, so thatthere is nothing of this nature to be tampered with or adjusted.

My invention consists in the novel features 7, and construction of parts hereinafter shown and described in their. preferred embodiment, and the invention is more particularly pointed out in the appended claims. 7

Further objects and advantages of the invention will more fully appear from the following description taken in connection with the accompanying drawings in whicli Figure l is a longitudinal sectional View of a .carburcter embodying the preferred form of my invention;

Fig. 2 shows an end view of the tank and a cross-sectional view of the mixing chamber, taken on. line 22 of Fig. 1; i

Fig. 3 shows a top plan ,viewof one end of the carburetor;

Fig. 4:,is a longitudinal section of a modified form of mixing chamber;

Fig. 5 is a similar view of another modification;

Fig. 6 is a transverse section taken on line 66 of Fig. 4; and

Fig. 7 is a transverse section taken on line 7-7 of Fig. 5. 7

Referring to the drawings, Figs. 1 to 3, the mixing chamber 1 is arranged horizontally and provided with an upturned neck 2 in which is pivoted a throttle valve 3. The main shell of the carbureter is rectangular at the intermediate portion thereof l, extendingabreast of the tank 5, while the intake portion 6 flares outwardly and is cylindrical, the upturned or neck portion 2 also being cylindrical and provided with a suitable connection fiange 7. The usual choke valve 8 is pivotally mounted in the intake portion 6, and is normally held open by a suitable spring 9 and is closed by any suitable lever such as 10.

I The shell forming the mixing chamber or passageway fits up against the tank and upon a lateral bracket 11 extending therefrom to which the shell is secured by a suitable screw 12, so that when this screw is removed, the tank can be removed from the mixing chamber for purposes of repair, etc., without disconnecting the carbureter from the manifold.

The lateral bracket 1 is provided with two orifices 13, 14:, communicating with the hydrocarbon tank, and these orifices are tapped as shown in Fig. 1 and suitable hydrocarbon nozzles 15, 16 are threaded into the tapped openings or branches from the orifices. The intermediate horizontal portion of the mixing chamber has a restricted section 17 in the form of a venturi, and in this instance it is provided by fitting a cast ing 18 within the intermediate portion of the chamber. This casting is rectangular in cross-section and adapted to fit within the chamber, and is, machined out cylindrically and tapering inwardly from each end toward the center to give the desired venturi shape.

The rear nozzle 15 is located within this Venturi tube in the position shown, and pro jects upwardly into the passageway approxi mately to the axial line thereof, while the other nozzle 16 extends into the upturned neck of the chamber and to the throttle valve, which preferably is provided with a notch 19 in register with the discharge end of the nozzle. The throttle valve 3 is operated by any suitable lever such as 20.

By extending the nozzle 1611p into the neck of the carbureter above the horizontal position and up close to the throttle valve and at one edge thereof, its discharge end is in position to receive substantially the full effect of the so-called suction above the throttle valve at low speeds when the throttle valve is barely opened, and even when closed if a notch is provided therein. The suction above the valve at such times is very much greater than the suction farther down in the mixing chamber, which at such times is substantially inappreciable. In view of this arrangement hydrocarbon will be readily discharged from nozzle 16 as soon as the engine is turned over, whereas by placing nozzle 15 farther back and into the horizontal portion of the passageway, hydrocarbon will not be discharged from this nozzle until the throttle valve 3 is opened, an appreciable extent to equalize the differences in pressure above the throttle valve and that in the horizontal portion of the chamber. As the throttle valve is opened more and more, the nozzle 15 becomes more effective in discharging hydrocarbon. It will also be noted that by extending the nozzle 16 up wellabove the nozzle 15 and over to the left of the aXis of the throttle valve, the hydrocarbon discharged from the nozzle 15 will sweep inwardly past the nozzle 16 and upwardly along the outer wall of the upturned neck portion, so that the hydrocarbon from the two nozzles is in this way more uniformly distributed in the current of air mixing therewith.

I have found that a carbureter constructed as described greatly facilitates the starting of an engine and is extremely flexible and satisfactory at low speeds, and yet gives satisfactory operation at high speeds.

Referring to Fig. 4, the parts are similar to those heretofore described, except that instead of providing a casting 18 closely fitting the intermediate portion of the horizontal passageway, I provide a cylindrical casting 25 bored out in the form of a Venturi tube and supported on a suitable spacing washer or nut 26 fitted over the nozzle 15 so as to provide a shunt passage 27, as shown in Figs. 4; and 6, for the flow of air around the Venturi tube. This permits of a more restricted venturi section for the dis charge nozzle 15".

Fig. 5 shows a modification in which the restricted section of the horizontal passageway is obtained by placing within the shell a casting 28 resting upon the wall of the shell and triangular in longitudinal section. In this form of the carbureter a tube 29 communicates with the orifice 13 leading from the tank, and the upper end ofthis tube communicates with a transverse passage or orifice 30 formed in the casting 28 and from this a series of small discharge orifices or nozzles 31 extend and through these the hydrocarbon is discharged into the passageway as shown in Figs. 5 and 7.

WVhere, in the appended claims, I refer to or mention a nozzle extending into the horizontal or restricted portion of the mixing chamber, it will be understood that I do not wish to limit myself to a single tube such as shown in Figs. 1 and 4, but that I wish to be understood as including in this expression any orifice or passage from which hydrocarbon is discharged, such for example as that shown in Fig. 5.

It will be obvious to those skilled in the art, after understanding my invention, that various changes and modifications may be made therein without departing from the spirit or scope of the invention, and I aim in the appended claims to cover such changes.

Having thus described my invention,what I claim as new and desire to secure by Letters Patent, is 1- 1. In a carbureter, the combination of a passageway for hydrocarbon mixture, said passageway having-a horizontal portion with an upturned end, a throttle valve in said upturned end, a restricted section in the horizontal portion of the passageway, a hydrocarbon nozzle extending upwardly into said restricted section approximately at the narrowest part thereof, and another nozzle discharginghydrocarbon into the passageway at the upturned end and discharging at a point above the top of the horizontal portion in the passageway and close up to the throttle valve, in position to be effectively acted upon by the suction above the throttle valve when the latter is barely opened.

2. In a carburetor, the combination of a passageway for hydrocarbon fuel, said pas sageway having a horizontal portion with an upturned end, a part of said horizontal portion having a restricted section provid ing a venturi effect with a shunt passagearound said restricted section, a throttle valve in the upturned end, a hydrocarbon nozzle discharging into said restricted section, and another hydrocarbon nozzle discharging into the upturned end close up to the throttle valve in position to be efiectively acted upon by the suction above the throttle valve when the latter is barely opened.

In testimony whereof I have signed my name to this specification.

FREDERICK R. SUNDERMAN. 

